From thousands of monarch butterflies painting the skies to massive herds of bison on the move, the U.S. is home to some of the most breathtaking animal migrations on Earth. These incredible journeys ...

The findings challenge previous assumptions about butterfly migration and highlight the role of phenotypic plasticity.

Painted lady butterflies are world travelers. The ones we encounter in Europe fly from Africa to Sweden, ultimately returning to areas north and south of the Sahara. But what determines whether some ...